Transitional icon for a portion of a display screen



FIG. 1 is a front view of the first image of a transitional icon for a portion of a display screen;

FIG. 2 is a front view of a second image thereof; and,

FIG. 3 is a front view of a third image thereof.

The broken line showing a portion of a display screen is for illustrative purposes only and forms no part of the claimed design.

The appearance of the image transitions sequentially between the images shown in FIGS. 1-3. The process or period in which an image transitions to another forms no part of the claimed design. 

The ornamental design for a transitional icon for a portion of a display screen, as shown and described. 